diff --git a/cmd.go b/cmd.go
index fe4b20e..61a64ce 100644
--- a/cmd.go
+++ b/cmd.go
@@ -67,6 +67,7 @@ func main() {
 	var expirationExpr string
 	var maxDepth int
 	var concurrent int
+	var keySize int
 	var err error
 	flagSet.StringVar(&cmd, "c", "", "command for rdb: json")
 	flagSet.StringVar(&output, "o", "", "output file path")
@@ -78,6 +79,7 @@ func main() {
 	flagSet.StringVar(&regexExpr, "regex", "", "regex expression")
 	flagSet.StringVar(&expirationExpr, "expire", "", "expiration filter expression")
 	flagSet.BoolVar(&noExpired, "no-expired", false, "filter expired keys(deprecated, please use expire)")
+	flagSet.IntVar(&keySize, "key-size", 0, "filter keys by its size")
 	_ = flagSet.Parse(os.Args[1:]) // ExitOnError
 	src := flagSet.Arg(0)
 
@@ -103,6 +105,9 @@ func main() {
 	if expirationExpr != "" {
 		options = append(options, helper.WithExpirationOption(expirationExpr))
 	}
+	if keySize >= 0 {
+		options = append(options, helper.WithKeySizeFilterOption(keySize))
+	}
 
 	var outputFile *os.File
 	if output == "" {
diff --git a/go.mod b/go.mod
index e961701..97d6435 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,6 @@ go 1.16
 
 require (
 	github.com/bytedance/sonic v1.12.1
-	github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.8 // indirect
 	golang.org/x/arch v0.9.0 // indirect
 	golang.org/x/sys v0.24.0 // indirect
diff --git a/go.sum b/go.sum
index 9fc9902..9f4403a 100644
--- a/go.sum
+++ b/go.sum
@@ -1,14 +1,8 @@
-github.com/bytedance/sonic v1.5.0/go.mod h1:ED5hyg4y6t3/9Ku1R6dU/4KyJ48DZ4jPhfY1O2AihPM=
-github.com/bytedance/sonic v1.8.7 h1:d3sry5vGgVq/OpgozRUNP6xBsSo0mtNdwliApw+SAMQ=
-github.com/bytedance/sonic v1.8.7/go.mod h1:i736AoUSYt75HyZLoJW9ERYxcy6eaN6h4BZXU064P/U=
 github.com/bytedance/sonic v1.12.1 h1:jWl5Qz1fy7X1ioY74WqO0KjAMtAGQs4sYnjiEBiyX24=
 github.com/bytedance/sonic v1.12.1/go.mod h1:B8Gt/XvtZ3Fqj+iSKMypzymZxw/FVwgIGKzMzT9r/rk=
 github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
 github.com/bytedance/sonic/loader v0.2.0 h1:zNprn+lsIP06C/IqCHs3gPQIvnvpKbbxyXQP1iU4kWM=
 github.com/bytedance/sonic/loader v0.2.0/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
-github.com/chenzhuoyu/base64x v0.0.0-20211019084208-fb5309c8db06/go.mod h1:DH46F32mSOjUmXrMHnKwZdA8wcEefY7UVqBKYGjpdQY=
-github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 h1:qSGYFH7+jGhDF8vLC+iwCD4WpbV1EBDSzWkJODFLams=
-github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311/go.mod h1:b583jCggY9gE99b6G5LEC39OIiVsWj+R97kbl5odCEk=
 github.com/cloudwego/base64x v0.1.4 h1:jwCgWpFanWmN8xoIUHa2rtzmkd5J2plF/dnLS6Xd/0Y=
 github.com/cloudwego/base64x v0.1.4/go.mod h1:0zlkT4Wn5C6NdauXdJRhSKRlJvmclQ1hhJgA0rcu/8w=
 github.com/cloudwego/iasm v0.2.0 h1:1KNIy1I1H9hNNFEEH3DVnI4UujN+1zjpuk6gwHLTssg=
@@ -16,7 +10,6 @@ github.com/cloudwego/iasm v0.2.0/go.mod h1:8rXZaNYT2n95jn+zTI1sDr+IgcD2GVs0nlbbQ
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/klauspost/cpuid/v2 v2.0.9 h1:lgaqFMSdTdQYdZ04uHyN2d/eKdOMyi2YLSvlQIBFYa4=
 github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
 github.com/klauspost/cpuid/v2 v2.2.8 h1:+StwCXwm9PdpiEkPyzBXIy+M9KUb4ODm0Zarf1kS5BM=
 github.com/klauspost/cpuid/v2 v2.2.8/go.mod h1:Lcz8mBdAVJIBVzewtcLocK12l3Y+JytZYpaMropDUws=
@@ -33,7 +26,6 @@ github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKs
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS4MhqMhdFk5YI=
 github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2+aY1QWCk3Cedj/Gdt08=
-golang.org/x/arch v0.0.0-20210923205945-b76863e36670 h1:18EFjUmQOcUvxNYSkA6jO9VAiXCnxFY6NyDX0bHDmkU=
 golang.org/x/arch v0.0.0-20210923205945-b76863e36670/go.mod h1:5om86z9Hs0C8fWVUuoMHwpExlXzs5Tkyp9hOrfG7pp8=
 golang.org/x/arch v0.9.0 h1:ub9TgUInamJ8mrZIGlBG6/4TqWeMszd4N8lNorbrr6k=
 golang.org/x/arch v0.9.0/go.mod h1:FEVrYAQjsQXMVJ1nsMoVVXPZg6p2JE2mx8psSWTDQys=
diff --git a/helper/regex.go b/helper/regex.go
index 8bbee09..5069588 100644
--- a/helper/regex.go
+++ b/helper/regex.go
@@ -74,6 +74,26 @@ func WithNoExpiredOption() NoExpiredOption {
 	return NoExpiredOption(true)
 }
 
+type keySizeDecoder struct {
+	dec  decoder
+	size int
+}
+
+func (d *keySizeDecoder) Parse(cb func(object model.RedisObject) bool) error {
+	return d.dec.Parse(func(object model.RedisObject) bool {
+		if object.GetSize() >= d.size {
+			return cb(object)
+		}
+		return true
+	})
+}
+
+type KeySizeOption int
+
+func WithKeySizeFilterOption(size int) KeySizeOption {
+	return KeySizeOption(size)
+}
+
 type ExpirationOption string
 
 func WithExpirationOption(expr string) ExpirationOption {
@@ -147,6 +167,7 @@ func wrapDecoder(dec decoder, options ...interface{}) (decoder, error) {
 	var regexOpt RegexOption
 	var noExpiredOpt NoExpiredOption
 	var expirationOpt ExpirationOption
+	var keySizeOpt KeySizeOption
 	for _, opt := range options {
 		switch o := opt.(type) {
 		case RegexOption:
@@ -155,6 +176,8 @@ func wrapDecoder(dec decoder, options ...interface{}) (decoder, error) {
 			noExpiredOpt = o
 		case ExpirationOption:
 			expirationOpt = o
+		case KeySizeOption:
+			keySizeOpt = o
 		}
 	}
 	if regexOpt != nil {
@@ -169,6 +192,12 @@ func wrapDecoder(dec decoder, options ...interface{}) (decoder, error) {
 			dec: dec,
 		}
 	}
+	if keySizeOpt >= 0 {
+		dec = &keySizeDecoder{
+			dec:  dec,
+			size: int(keySizeOpt),
+		}
+	}
 	if expirationOpt != "" {
 		if expirationOpt == "noexpire" {
 			dec = &noExpirationDecoder{